Materials Literature
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The Bacillus subtilis araR locus (mapped at about 294 degrees on the genetic map) comprises two open reading frames with divergently arranged promoters, the regulatory gene, araR, encoding a repressor, and a partially cloned gene, termed araE by analogy to the Escherichia coli L-arabinose permease gene. Here, we repor…
Measurements of sonoluminescence from isolated cavities that spontaneously form on solid objects in a fluid-filled acoustic resonator are reported. The subnanosecond light flashes have a smooth ultraviolet spectrum similar to that from single bubbles, although with organic liquids low intensity Swan lines ride on the…
Antibody 03-1, which was prepared by immunization with meso-tetrakis(4-carboxyphenyl)porphyrin (TCPP) conjugate, has been found to bind strongly to Mn(III)-TCPP and Fe(III)-TCPP complexes with dissociation constants of 4.1 x 10(-)(7) and 1.5 x 10(-)(7) M, respectively, although other monoclonal antibodies raised again…
The aging phenomena of porous silicon (PS) over a 192 day time span have been studied using photoluminescence (PL) spectroscopy, Fourier transform infrared spectroscopy, and transmission electron microscopy. As-prepared PS exhibits red PL peaking near 650 nm. The PL intensity increases with time to some equilibrium va…
The surfaces of emeraldine (EM) base films of polyaniline (PANi) have been functionalized by thermal graft copolymerization with acrylic acid (AAc) and N, N -dimethyl(methacryloylethyl)ammonium propanesulfonate (DMAPS). The AAc graft copolymerized EM films were further functionalized via covalent immobilization of glu…
Abstract (CuI) 2 Cu 3 SbS 3 was prepared by solid‐state reaction of stoichiometric amounts of CuI, Cu, S, and Sb. The crystal structure was determined from single crystals at room temperature and ‐ 80°C. Red‐orange (CuI) 2 Cu 3 SbS 3 crystallizes in the orthorhombic system, space group Pnnm (no. 58) with a = 10.488(2)…
Online studies of structure and morphology development during continuous drawing of a nylon 66 fiber at different temperatures were carried out using synchrotron wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) techniques. From the two-dimensional (2D) WAXD measurement, unit-cell parameters…
The evolution of tidally truncated globular clusters is investigated by integrating a two-dimensional Fokker-Planck equation that allows the development of velocity anisotropy. We start from the isotropic Plummer model with tidal cut-off and follow the evolution through the core collapse. The heating by a three-body b…
The reaction of Pd with a molten mixture of A(2)Q(x)()/P(2)Q(5)/Q (A = K, Q = S, x = 3; A = Cs, Q = Se, x = 1) produced the molecular compounds K(4)Pd(PS(4))(2) (I), Cs(4)Pd(PSe(4))(2) (II), and Cs(10)Pd(PSe(4))(4) (III) and the solid-state KPdPS(4) (IV), K(2)PdP(2)S(6) (V), and Cs(2)PdP(2)Se(6) (VI). Compounds I-III…
Physico-chemical cell surface properties of 23 coagulase-negative staphylococcal strains, including contact angles, zeta potentials and elemental cell surface composition were measured, together with the adhesion of all strains to hexadecane. The data were employed in a hierarchical cluster analysis, revealing that th…
The synthesis and characterization of the following heterosapphyrins is presented: 3,7,18,22-tetraethyl-2,8,12,13,17,23-hexamethyl-27-oxasapphyrin ( 5 ), 3,8,12,13,17,22-hexaethyl-2,7,18,23-tetramethyl-15,29-dioxasapphyrin ( 6 ), and 3,7,18,22-tetraethyl-2,8,12,13,17,23-hexamethyl-15,27,29-trioxasapphyrin ( 7 ). These…
Novel model block copolymers of ( R,S )-β-butyrolactone with pivalolactone (PVL) are prepared in order to define the effect of crystalline domains provided by poly(pivalolactone) on the biodegradability of atactic poly(β-butyrolactone), a-PHB. The “living” a-PHB is synthesized from racemic β-butyrolactone, in the pres…
X-ray powder diffraction is one of the most sensitive methods for the analysis of crystalline forms of silica. In addition to detection and quantification, it can determine the specific crystalline species in the sample. The principal limitations of the method depend on the effective volume of the sample in the X-ray…
Abstract The substructure of natural clinotobermorite Ca 5 [Si 3 O 8 (OH)] 2 · 4 H 2 O \p=n-\ Ca 5 [Si 6 O l7 ] · 5 H 2 O from the Wessels mine, Kalahari manganese field, South Africa, was determined from single-crystal X-ray data. The diffraction pattern (monoclinic: a = 11.19 Å, b = 7.29 Å, c = 22.46 Å, β = 96.97°)…
The transition between the merocyanine and spiropyran forms switches the selectivity of the bis(spiropyran) azacrown ether 1 from La3+ to K+ [Eq. (1)]. Thus, 1 offers much greater possibilities for selectivity control between multi- and monovalent metal ions than the corresponding unsubstituted azacrown ether.
Abstract Hyperbranched polymethacrylates were synthesized by group transfer self-condensation polymerization of 2-(2-methyl-1-triethylsiloxy-1-propenyloxy)ethyl methacrylate. The hyper-branched structure of the polymer was characterized by 13C NMR spectroscopy. The extent of the branching depended on the nucleophilic…
Infrared (IR) spectra were measured for three 4‘- n -alkoxy-3‘-nitrobiphenyl-4-carboxylic acid homologues [ANBC- n, where the carbon number of the alkoxy group ( n ) is 14, 16, and 22] as a function of temperature. The phase sequences for ANBC-14, -16, and -22 are crystal (C)−smectic C (S C )−smectic A (S A )−“structu…
We have studied the origin of field emission from wide band-gap semiconductors by a combination of voltage dependent field-emission energy distribution and I–V measurements. For this purpose, tip-shaped molybdenum emitters were coated with 100–1000 nm thick layers of nominally undoped diamond and cubic boron nitride (…
A resistor network model is developed for solid oxide fuel cell (SOFC) composite anodes, in which solid electrolyte grains, metal particles, and pores are considered on the same footing. The model is studied by a Monte Carlo simulation on a face‐centered cubic lattice, with a random distribution of the three component…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPhoto-optical Control with Large Refractive Index Changes by Photodimerization of Poly(vinyl cinnamate) FilmSeiichiro Murase, Koichi Kinoshita, Kazuyuki Horie, and Shin'ya MorinoView Author Information Department of Chemistry and Bi…